I wonder if there's a story behind the different colored webbing or if the colorist is just trying to be different....?

Perhaps it's a clue to what is really under the mask...
Perhaps

Spoiler!!! Click to Read!:

It's someone who was around during Spider-Island, got the virus, but had something in them that kept them from transforming into a monster. I.e. Norman Osborn was in hospital, got virus, but serum kept him from transforming.

It doesn't necessarily mean he is Doc Ock. From the looks of it the artist seems to be implying they're two halves of a whole, so it's possible their personalities fuse, creating an edgier Spider-Man so to speak with the desire to still protect people like Peter. It also looks like he's lost some of his powers to me somehow. He needs talons like O'Hara now to climb walls and judging by this interior art...

....Spider-Man has lost his spidey sense. It also appears he wears goggles to protect his eyes. As has been speculated all of this points to O'Hara being the new Spider-Man, but that would be too obvious at this point and wouldn't explains that cover of the Superior Spider-Man kissing MJ. My guess is that somehow in 700 Peter's body loses its powers along with becoming fused with Doc Ock. But since he still wants to protect people, we're shown in Avenging Spider-Man 15.1 (the comic that's being released alongside Amazing 700 and is supposed to give closure to it) he develops a new suit that makes up for his lack of powers. And thus, it would make the "Superior" title an ironic label, since this new version of Spider-Man is actually physically weaker and less "amazing" than the old one...yet you could also say he's mentally superior for still wanting to help people even without his powers.

__________________Extremelyoffensive, always insulting, completely defiant... an absolutely disrespectful prick
He can't be managed, he can't be controlled... that's because he's a totally disruptive ass-ole
He's content to be a good-for-nothing, smart-ass, trouble-making, rule-breaking malcontent
Don't even THINK of penalizing him based upon your incorrect, inaccurate assumption of him
No one EVER gets the better of the bad guy... and I AMthe badguyand wiseguyof this story
-- Posse Whipped 'n Licked

__________________Extremelyoffensive, always insulting, completely defiant... an absolutely disrespectful prick
He can't be managed, he can't be controlled... that's because he's a totally disruptive ass-ole
He's content to be a good-for-nothing, smart-ass, trouble-making, rule-breaking malcontent
Don't even THINK of penalizing him based upon your incorrect, inaccurate assumption of him
No one EVER gets the better of the bad guy... and I AMthe badguyand wiseguyof this story
-- Posse Whipped 'n Licked

if MJ is willing, thinking that it's Peter and she's none the wiser... well, you know how THAT'LL go...

__________________Extremelyoffensive, always insulting, completely defiant... an absolutely disrespectful prick
He can't be managed, he can't be controlled... that's because he's a totally disruptive ass-ole
He's content to be a good-for-nothing, smart-ass, trouble-making, rule-breaking malcontent
Don't even THINK of penalizing him based upon your incorrect, inaccurate assumption of him
No one EVER gets the better of the bad guy... and I AMthe badguyand wiseguyof this story
-- Posse Whipped 'n Licked

It doesn't necessarily mean he is Doc Ock. From the looks of it the artist seems to be implying they're two halves of a whole, so it's possible their personalities fuse, creating an edgier Spider-Man so to speak with the desire to still protect people like Peter. It also looks like he's lost some of his powers to me somehow. He needs talons like O'Hara now to climb walls and judging by this interior art...

....Spider-Man has lost his spidey sense. It also appears he wears goggles to protect his eyes. As has been speculated all of this points to O'Hara being the new Spider-Man, but that would be too obvious at this point and wouldn't explains that cover of the Superior Spider-Man kissing MJ. My guess is that somehow in 700 Peter's body loses its powers along with becoming fused with Doc Ock. But since he still wants to protect people, we're shown in Avenging Spider-Man 15.1 (the comic that's being released alongside Amazing 700 and is supposed to give closure to it) he develops a new suit that makes up for his lack of powers. And thus, it would make the "Superior" title an ironic label, since this new version of Spider-Man is actually physically weaker and less "amazing" than the old one...yet you could also say he's mentally superior for still wanting to help people even without his powers.

I agree, I'll be checking that out as well. I think there's a fair chance that with the mindset of the person in question combined with Peter Parker he could very well be superior in many ways. The way he spoke to MJ in 698 alone shows he was actually capable of moving forward with emotions and just laying things out there without the typical "well he's peter parker so even if he goes out to get coffee he needs to be seen screwing up completely an being an utter failure" that we've had for so long.

On a side note completely unrelated to the topic at hand one of my favorite Spider-Man stories was Spider-Man/Doc Ock Year one.

It doesn't necessarily mean he is Doc Ock. From the looks of it the artist seems to be implying they're two halves of a whole, so it's possible their personalities fuse, creating an edgier Spider-Man so to speak with the desire to still protect people like Peter. It also looks like he's lost some of his powers to me somehow. He needs talons like O'Hara now to climb walls and judging by this interior art...

....Spider-Man has lost his spidey sense. It also appears he wears goggles to protect his eyes. As has been speculated all of this points to O'Hara being the new Spider-Man, but that would be too obvious at this point and wouldn't explains that cover of the Superior Spider-Man kissing MJ. My guess is that somehow in 700 Peter's body loses its powers along with becoming fused with Doc Ock. But since he still wants to protect people, we're shown in Avenging Spider-Man 15.1 (the comic that's being released alongside Amazing 700 and is supposed to give closure to it) he develops a new suit that makes up for his lack of powers. And thus, it would make the "Superior" title an ironic label, since this new version of Spider-Man is actually physically weaker and less "amazing" than the old one...yet you could also say he's mentally superior for still wanting to help people even without his powers.

Yeah, I notice the lack of spider-sense in those images as well. And I also agree that, based on where things stand right now (especially with those linking variant covers for Amazing Spider-Man #700 and Superior Spider-Man #1) it does look very plausible that like we're going to get a Peter Parker/Doc Ock merge a la Firestorm. Especially given how Amazing Spider-Man #699 explains how Doc Ock did the mind swap:

Spoiler!!! Click to Read!:

Notice that Peter says that the gold octobot hacked into his brain and rewrote it with Doc Ock's brain patterns, and then did the reverse to Doc Ock. While the issue doesn't actually state it outright, that technically means that Peter is still Peter, only now he literally thinks like Doc Ock and Doc Ock is still Doc Ock only he now literally thinks like Peter, meaning there wasn't a literal swapping of minds. Because brain patterns are not synonymous with a mind.

So yeah, the Superior Spider-Man being a hybrid of Peter Parker and Doc Ock seems like the strongest possibility at this point. Unless Dan Slott pulls a very out of left field swerve like having Paste Pot Pete be the Superior Spider-Man, of course.

Oh, and something else that was brought to my attention:

Spoiler!!! Click to Read!:

Notice how in Amazing Spider-Man #699, when Peter begins rifling through Doc Ock's memories to try and come up with an escape plan, one of the things he makes mention of is "robot duplicates?" Hmm...